body, html {
    height: 100%;
    margin: 0 ;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f7f7f7;
  }
  
  .container {
    text-align: center;
    background-color: aqua;
    padding: 20px;
    border: 1px solid #ccc;
    width: auto;
  }
  
  .input-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
  }
  
  .input-number {
    box-sizing: border-box;
    width: 100px; 
    margin: 0 10px;
    padding: 5px;
  }
  
  #calculate {
    padding: 5px 15px;
    width: 80px;
    cursor: pointer;
    background-color: #f0f0f0;
    border: 1px solid #ccc;
  }
  
  #result {
    margin: 20px auto;
    height: 40px;
    width: 75%;
    padding: 20px;
    border: 1px dotted goldenrod;
    background-color: rgb(221, 220, 220);
    font-weight: bold;
  }